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  • Formaat: 188 pages
  • Ilmumisaeg: 26-Jul-2005
  • Kirjastus: National Academies Press
  • Keel: eng
  • ISBN-13: 9780309548472

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High-field magnetsthose that operate at the limits of the mechanical and/or electromagnetic properties of their structural materialsare used as research tools in a variety of scientific disciplines. The study of high magnetic fields themselves is also important in many areas such as astrophysics. Because of their importance in scientific research and the possibility of new breakthroughs, the National Science Foundation asked the National Research Council to assess the current state of and future prospects for high-field science and technology in the United States. This report presents the results of that assessment. It focuses on scientific and technological challenges and opportunities, and not on specific program activities. The report provides findings and recommendations about important research directions, the relative strength of U.S. efforts compared to other countries, and ways in which the program can operate more effectively.Table of Contents



Front Matter Executive Summary 1 Introduction 2 Scientific Challenges and Opportunities with Higher Fields 3 Technological Challenges and Opportunities for Developing Higher Fields 4 Conclusions and Recommendations Appendix A Nobel Prizes for Research That Used or Significantly Affected the Development of High Magnetic Fields Appendix B High-Field Magnet Facilities Around the World Appendix C Glossary Appendix D Meeting Agendas Appendix E Input from the Community Appendix F Biographies of Committee Members and Staff Appendix G Tutorial on High-Temperature Superconductivity Appendix H Tutorial on Frontiers in Vortex Physics
Executive Summary 1(6)
Introduction
7(7)
The Importance of Magnetism in the Modern World
7(1)
The Significance of High Magnetic Field Research
8(1)
The Task of the Committee
9(1)
Definition of High Magnetic Field
10(1)
High-Field Magnets
10(4)
Scientific Challenges and Opportunities with Higher Fields
14(55)
Condensed-Matter and Materials Physics
15(31)
High-Temperature Superconductivity
18(10)
Heavy Fermion Systems
28(6)
Low-Dimensional Semiconductors
34(4)
Organic Conductors and Superconductors
38(2)
Combining High Fields with X-Ray and Neutron Scattering
40(4)
Future Needs
44(2)
High-Field Facilities for Materials Research
46(1)
Magnetic and Ion Cyclotron Resonance: Applications of High Fields to Biology, Chemistry, and Materials Research
46(20)
Introduction to NMR
47(3)
The Role of Field Strength in NMR
50(2)
Recent Developments in Solution NMR
52(1)
Solid-State NMR
53(1)
NMR in Condensed-Matter Physics
54(2)
Magnetic Resonance Imaging
56(1)
Prospects for Improvements with Still Higher Fields
57(4)
Strategic Considerations for Higher Field NMR
61(1)
Ion Cyclotron Resonance
62(1)
Electron Paramagnetic Resonance
63(1)
Importance of Ancillary Technological Development
64(2)
Other Scientific Uses of High-Field Magnets
66(3)
Technological Challenges and Opportunities for Developing Higher Fields
69(34)
What Is the Challenge?
69(4)
Resistive DC Magnets
73(2)
Present Status
74(1)
Outlook for Resistive DC Magnets
75(1)
Pulsed Magnets
75(7)
Advantages and Disadvantages
78(3)
The Potential for Expanding the Use of Pulsed Magnets
81
Outlook for Pulsed Magnets
8(74)
Superconducting Magnets
82(1)
Superconductors Used for Magnet Construction
83(1)
Economic Considerations
84(1)
Additional Conductor Requirements: H
85(3)
Critical Current Densities
88(1)
Existing Conductor Materials
88(10)
Emerging Superconducting Materials
93(3)
Superconducting Magnet Design
96(2)
Outlook for Superconducting Magnets
98(1)
Hybrid Magnets
98(4)
Design Challenges
100(1)
Outlook for Hybrid Magnets
101(1)
Coordination of Magnet Development
102(1)
Conclusions and Recommendations
103
Conclusions
103
Current State and Future Prospects
103
U.S. High-Field Efforts in the International Context
104
Promising Multidisciplinary Areas for Research and Development
105
Major Construction Initiatives for the Coming Decade
106
Recommendations
106
APPENDIXES
Nobel Prizes for Research That Used or Significantly Affected the Development of High Magnetic Fields
115
High-Field Magnet Facilities Around the World
116
Glossary
138
Meeting Agendas
147
Input from the Community
151
Biographies of Committee Members and Staff
154
Tutorial on High-Temperature Superconductivity
162
Tutorial on Frontiers in Vortex Physics
166


Committee on Opportunities in High Magnetic Field Science, Solid State Sciences Committee, National Research Council